It is hereby declared to be the policy of the United States that certain selected rivers of the Nation which, with their immediate environments, possess outstandingly remarkable scenic, recreational, geologic, fish and wildlife, historic, cultural or other similar values, shall be preserved in free-flowing condition, and that they and their immediate environments shall be protected for the benefit and enjoyment of present and future generations.
~Wild & Scenic Rivers Act, October 2, 1968
Michigan has 16 nationally designated Wild & Scenic Rivers (management plan pdf) . Two of them are called the Sturgeon River: this one in the Ottawa National Forest in the eastern UP and the Sturgeon River in the Hiawatha National Forest in the western UP. This Sturgeon River is even the photo on the main page at rivers.gov, so it’s clear that they really liked it!!
Also note that Field & Stream tapped Michigan #1 for flyfishing in the USA in 2011. One of the reasons is the portion of the Sturgeon River within the Ottawa National Forest is classified as a Blue Ribbon Trout Stream!